Add old_state parameter to CustomButton::StateChanged

ui/views/controls/button/md_text_button.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/button/md_text_button.h"
 
 #include "base/i18n/case_conversion.h"
 #include "base/memory/ptr_util.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/gfx/canvas.h"
@@ skipping 117 matching lines @@
 }
 
 std::unique_ptr<views::InkDropRipple> MdTextButton::CreateInkDropRipple()
     const {
   return std::unique_ptr<views::InkDropRipple>(
       new views::FloodFillInkDropRipple(
           size(), GetInkDropCenterBasedOnLastEvent(), GetInkDropBaseColor(),
           ink_drop_visible_opacity()));
 }
 
-void MdTextButton::StateChanged() {
-  LabelButton::StateChanged();
+void MdTextButton::StateChanged(ButtonState old_state) {
+  LabelButton::StateChanged(old_state);
   UpdateColors();
 }
 
 std::unique_ptr<views::InkDropHighlight> MdTextButton::CreateInkDropHighlight()
     const {
   // The prominent button hover effect is a shadow.
   const int kYOffset = 1;
   const int kSkiaBlurRadius = 2;
   const int shadow_alpha = is_prominent_ ? 0x3D : 0x1A;
   std::vector<gfx::ShadowValue> shadows;
@@ skipping 147 matching lines @@
         stroke_color, gfx::kDisabledControlAlpha);
   }
 
   DCHECK_EQ(SK_AlphaOPAQUE, static_cast<int>(SkColorGetA(bg_color)));
   set_background(Background::CreateBackgroundPainter(
       Painter::CreateRoundRectWith1PxBorderPainter(bg_color, stroke_color,
                                                    kInkDropSmallCornerRadius)));
 }
 
 }  // namespace views